Diablo III XP Bonus

Battle.net announces
that for a limited time, playing Diablo III on Windows or OS X will net
players a 50% experience point bonus in the action/RPG sequel to pave the way
for the release of the Reaper of Souls expansion at the end of this
month:

This hefty XP bonus gives your heroes a leg up on the new Paragon
Leveling System, which just went live in patch 2.0.1. The new Paragon Leveling
system not only allows ALL of your characters to share and contribute towards a
single account-wide Paragon level, but it also grants bonus ability points with
each Paragon level gained, which can be discretionally assigned to your
character’s stats.